做不做「正确的事」是一种选择，是否选择颠覆也是一种选择。
Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
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dominating the US market, leaving IBM little room to fit in.，推荐阅读heLLoword翻译官方下载获取更多信息
这里用的是 平行光，模拟太阳光。